/**
 * Copyright &copy; 2015-2020 <a href="http://www.jeeplus.org/">JeePlus</a> All rights reserved.
 */
package com.godtree.util;

import java.security.SecureRandom;
import java.util.UUID;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Service;

/**
 * 封装各种生成唯一性ID算法的工具类.
 *
 * @author jeeplus
 * @version 2016-01-15
 */
@Service
@Lazy(false)
public class IdGen {

  private static SecureRandom random = new SecureRandom();

  /**
   * 封装JDK自带的UUID, 通过Random数字生成, 中间无-分割.
   */
  public static String uuid() {
    return UUID.randomUUID().toString().replaceAll("-", "");
  }

  /**
   * 使用SecureRandom随机生成Long.
   */
  public static long randomLong() {
    return Math.abs(random.nextLong());
  }

  /**
   * 基于Base62编码的SecureRandom随机生成bytes.
   */
  public static String randomBase62(int length) {
    byte[] randomBytes = new byte[length];
    random.nextBytes(randomBytes);
    return Encodes.encodeBase62(randomBytes);
  }


  public static void main(String[] args) {
    System.out.println(IdGen.uuid());
    System.out.println(IdGen.uuid().length());
    for (int i = 0; i < 1000; i++) {
      System.out.println(IdGen.randomLong() + "  " + IdGen.randomBase62(5));
    }
  }

}
